Two people have been killed in Rio de Janeiro after an elevated bike lane, built especially for the Olympic Games this summer, collapsed onto the beach below.

The devastating incident happened after a strong wave hit the Tim Maia Bike Path, breaking off a 150ft (50 meter) stretch of the cycleway.

There were reportedly five people on the path at the time of the collapse. One person who may have been washed into the sea is still unaccounted for, according to Rio Municipal Secretary Pedro Paulo Carvalho, who spoke to Globo News.

The 3.9km (5.5 mile) long path, which opened only three months ago, cost US$12.5 million and links the beachfront neighborhoods of Leblon and Sao Conrado.

Carvalho and Rio’s City Hall described the incident as “unforgivable”, but said it was too early to determine what caused it. Carvalho confirmed engineers, the Municipal Works, and the company who built the bike lane, Concremat, were being summoned as an investigation gets underway.